/*
* Copyright 2011 Mozilla Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.mozilla.grouperfish.text.filter;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Map;
import java.util.regex.Pattern;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
import com.cybozu.labs.langdetect.Detector;
import com.cybozu.labs.langdetect.DetectorFactory;
import com.cybozu.labs.langdetect.LangDetectException;
public class LanguageFilter {
public LanguageFilter(String profileDirectory) throws LangDetectException {
DetectorFactory.loadProfile(profileDirectory);
}
// isLanguage("The quick brown fox.", "en")
public boolean isLanguage(String text, String langAbbr) {
Detector detector;
boolean isLang = false;
try {
detector = DetectorFactory.create();
detector.append(text);
isLang = detector.detect().startsWith(langAbbr);
} catch (LangDetectException e) {
//System.out.println("Could not detect language on: " + text);
}
return isLang;
}
public static void main(String[] args) throws IOException {
String inputPath = args[0];
String profilesPath = args[1];
String desiredLang = args[2];
String outputPath = args[3];
ObjectMapper jsonMapper = new ObjectMapper();
BufferedReader reader = null;
BufferedWriter writer = null;
try {
LanguageFilter langFilter = new LanguageFilter(profilesPath);
reader = new BufferedReader(new InputStreamReader(new FileInputStream(inputPath), "UTF-8"));
writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outputPath), "UTF-8"));
String line = null;
Pattern tabPattern = Pattern.compile("\t");
long total = 0;
long passed = 0;
while ((line = reader.readLine()) != null) {
total++;
String[] fields = tabPattern.split(line);
// Skip if we have more tabs (work around this later)
if (fields.length != 2) continue;
Map<String,Object> jsonMap = jsonMapper.readValue(fields[1], new TypeReference<Map<String,Object>>() { });
// Filter lang. detection
// !fields[6].toLowerCase().startsWith(desiredLang) &&
if (!langFilter.isLanguage((String)jsonMap.get("text"), desiredLang)) continue;
// Write original line back to output
writer.write(line);
writer.write('\n');
passed++;
if (total % 1000 == 0) {
System.out.printf("Processed %d lines\n", total);
}
}
System.out.printf("Percentage that passed: %.2f%%\n", ((float)passed/(float)total)*100.0f);
} catch (LangDetectException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}